wpcf7->skip_mail = true not working

Hello,

I am using following code

add_action( ‘wpcf7_before_send_mail’, ‘my_posted_data’,99 );

function my_posted_data( $contact_form ) {
$title = $contact_form->title;
$wpcf7 = WPCF7_ContactForm::get_current();
if ( some condition )
wpcf7->skip_mail = true;
return wpcf7;
}

Here even if the if condition is true the mail is not getting skipped.
This problem is occuring from the time I have updated my contact form 7 plugin to version 4.9
Please Help me with this!